I have a situation where a wall mounted oven is mounted in a base cabinet. The original installer mounted a receptacle behind the oven. But, I don't believe this is accessible as the oven would have to be unscrewed & removed to gain access. They also installed the 120 volt receptacle for the gas cooktop ignition in the same area. I believe that I have to relocate the 120 receptacle and install the j-box for the new hard-wired oven in the back of an adjacent base cabinet, but if I don't have to do so, I would like to leave the wiring intact in order to minimize the cost to these senior citizens.